Muffler



y 13, 1930- I A. F. DORMEYER 1,758,654

MUFFLER Filed March 19, 1928 Patented May 13, 1930 UNITED STATES ALBERT F. DORMEYER, OF CHICAGO, ILLINOIS MTL FFLER Application filed March 19, 1928.

This invention pertains to m'uiflers for silencing or blending the staccato reports of the explosion exhaust of internal combustion engines and the like, and while particu- 5 larly adapted for internal combustion engines of the explosion type, may be used in connection with other types of power plants. The invention disclosed herein is an improvement upon that described and claimed in my 19 copcnding application Serial No. 117,294,

filed June 21, 1926, entitled Mulllers.

One of the primary objects of the present invention is to provide a more ellicient, simple and economical construction than that described-in my said copending application.

different streams and in part retarded,- then Another important object is to provide a. novel type of bafile element and a novel type of battle element arrangement whereby the gases of each explosion are broken up into rebroken into different streams and in part retarded. and so on, during their passage through the niufiler, and whereby the gases of each explosion will be caused to travel suc- D J within the muffler casing, serve to partition the casing longitudinally and transversely into a number of chambers and in which the battle elements, due to their construction, are

. substantially self-supporting.

Still further objects, advantages, functions and uses otthe invention will be or should become readily appreciated after reading the following. description and claims and l1 after viewing the drawing in which,

Fig. 1 is a longitudinal view of one form of mufller constructed in accordance with the invention, a portion being broken away to show the battles,

Fig. 2 is a similar view of the same mufiler Serial No. 262,918.

construct-ion taken substantially along the center line of Fig. 1, and

Fig. 3 is a transverse sectional view taken along the line 33 of Fig. 2 looking inthe direction of the arrows.

The muffler illustrated is preferably made of sheet metal and includes what may be termed upper and lower semi-cylindrical casing sections 2 and 3 and a plurality of balile elements, generally designated 4;, which are suitably secured by and between the casing sections 2 and 3 after the manner fully described in my copending application, but which will be briefly described herein.

Each casing section is provided with spaced transversely extending corrugations 5 which not only serve to strengthen the sheet metal,- but also provide internal grooves or recesses into which the semi-circular edges of the ba'file ortions of the bafile elements extend and are received and secured, as will be understood. The sections 2 and 3 may be secured together in any manner, but I prefer to provide each with flanges 6 along its longitudinal edges so that the parts of the casing may be welded, riveted or bolted together and so that marginal portions 7 of the battle elements t may be rigidly clamped between the flanges. This produces a very simple. yet strong, rigid, and effective structure.

Each element 4 is made from sheet metal and while some respects alternate elements differ slightly from one another, as will be pointed out, they are all substantially of Z-shape having a longitudinally extending web portion 8 and two legs or baffle portions 9 and 10, struck up substantially at right angles to the web 8 and extending. in oppiosit-e directions.

The marginal edges 7 are. of course. in the present construction, formedon the web portions 8, While the grooves 5 receive the free end edges of the baffle portions 9 and 10, which at these edges are made semi-circular for the purpose. The spacing of the webs 8 is such that while the leg or portidn 9 is rece iv'ed in one corrugation in one section ofthe casing, the opposite leg portion 10 is received in the next succeeding corrugation theother half (if the" casing,- ai'id succeed-- ing elements abut one another, as shown at 11, to provide a substantial continuity of the longitudinal Web or partition and a strengthening of the assembly.

From the foregoing, it will be observed that the construction provides a plurality of What I shall term expansion chambers on each side of the longitudinal partition or web formed by the web portions 8. Each web and leg portion 8, 9 and 10 is provided with a plurality of openings at the end of a tapered passage, tapered in the direction of gas flow. These apertures or openings through the baflies are of different size in the leg portions 9 and 10, although they may be of the same size throughout all of the Web portions 8. For instance, viewing the left hand end of Fig. 2, the apertures or openings 12 are smaller than the apertures or openings 13 which are, in the embodiment illustrated, of the samesize the apertures 14. In the next succeeding baffle the apertures or openings 15 are all of the same size, whereas in the next succeeding baffle the apertures 16 and the leg portions 9 and 10 are of the same size, but smaller than the apertures 17 in the web 8 thereof. This arrangement is continued throughout for all of the baiile elements, every other baflle element having all of its apertures of the same size and intermediate elements having the apertures or openings through the leg portions of smaller size than the apertures or openings through the web portions and smaller than the apertures through the preceding and succeeding baffie elements.

Thus the gases from an explosion, when they enter the left hand end of the muffler illustrated, are divided and a larger proportion pass through the apertures 13 and 14 than through the apertures 12 of the first baffie element. The gasesvwhich have passed into the first lower chamber pass into the second lower chamber where their direct passage, on through the muffler, is retarded by the small apertures 16 of the next succeeding battle element. Therefore, a large proportion of the gases are forced upwardly into the chamber there-above and there mingle with some of the gases which have passed through the small apertures 12. This division and retarding and intermingling of the gases continues through the remaining elements and chambers until the right hand end of the muiiler is reached Where they pass out in a substantially continuous uninterrupted stream, As the gases pass through the ori fices or openings in the bafiies their pressures are reduced and their velocities increased, due to the Venturi construction of the walls he openings, but when they enter the succeeding chamber they expand, their velocity is red ced and their pressure increased. This action aids in breaking up and intermingling or blending the gases and is fective for its purposes.

It is believed that the functions, advantages and uses of the particular embodiment of the invention illustrated and described will be appreciated from the foregoing. However, since various modifications and arrangements may be made in the construction illustrated and described, I do not desire to be limited thereto, but only by the spirit of the invention and the scope of the appended claims.

I'claim:

1. A muiller comprising a longitudinal casing, a plurality of structurally independent battle elements, each substantially of Z-shape in side elevation, so disposed in said casing as to provide a substantially continuous longitudinal \veb portion and transverse baflle portions extending from each side ofthe Web portion to the casing, and means securing said elements in their relative positions in said. casing.

2.. A mufiler comprising a longitudinal casing, and a plurality of structurally independent baffle elements disposed in series Within said casing, each element having a longitudinally extending portion and oppositely directed transverse portions integral with the first said portion and extending from opposite ends thereof to the interior wall of the casing.

3. A mufiier comprising a substantially cylindrical casing, a plurality of structurally independent sheet metal elements disposed in particularly efsaid casing, each element being substantially Z-shaped with the webs of the Zs directed longitudinally of the casing and substantially contiguous with one another and with the top and bottom portions of the Zs directed transversely of the casing, and means securing said elements in their relative positions in said casing.

4:; A muffler comprising a substantially cylindrical casing and a plurality of sheet metal baffle elements disposed in said casing, each element having a portion extending longitudinally and transversely of the casing and two end portions bent'substantially at right angles to the first said portions in opposite directions and extending transversely of the casing, all of the elements being disposed in the casing with the first said portions of each in substantial alignment and so as to provide a substantially continuous partition longitudinally of the casing.

5. A mufiier comprising a sheet metal casing, a plurality of Z-shaped transverse sheet metal baffies therein, said battles each having a plurality of hollow conical projections truncated at their apices to provide an opening through each, the walls about and defining the openings in the baffles converging in the direction of the line of flow of gases through the muiiler.

6. A1 uiiler comprising a casing and a plurality of transverse, space l sheet metal hallles of Z-shape therein, adjacent bafiles defining a gas receiving chamber between them, each batlle upstream relative to the direction of gas flow having a plurality of hollow conical projections truncated at their apices to provide an opening through each, said projections projecting into said chamber; the surrounding Walls of each opening converging in the direction of gas flow.

7. A mufiler comprising a longitudinal casing, a plurality of structurally independent baille elements, each substantially of Z-shape in side elevation, so disposed in said casing as to provide a substantially continuous longitudinal web portion and transverse bathe portions extending from each side of the Web portion to the casing, and means securing said elements in their relative positions in said casing, each transverse battle portion and said Web portion having a plurality of apertures the rethrough.

8. A muil'ler comprising a longitudinal casing. a plurality of structurally independent battle elements, each substantially o't Z-shape in side elevation, so disposed in said casing as to provide a substantially continuous longitudinal Web portion and transverse bathe portions extending from each side of the Web portion to the casing, and means securing said elements in their relative positions in said casing, each transverse baffle portion and said Web portion having a plurality of gas passages therethrough, said passages having Walls converging in the direction of gas flow.

9. A muttler comprising a longitudinal casing, and a plurality of structurally independent hafile elements disposed in series Within said casing, each element having a longitudinally extending portion and oppositely directed transverse portions integral With the first said portion and extending from opposite ends thereof to the interior wall of the casing, each transverse portion having a plurality of openings therethrough, said openings having Walls converging in the normal. direction of gas flow.

10. A muflier comprising a longitudinal casing, and plurality of structurally independent ballie elements disposed in series Within said casing, each element having a longitudinally extending portion and oppositely directed transverse portions iiitegral with the first said portion and extending from opposite ends thereof to the interior Wall of the casing, each transverse portion and each longitudinally extending portion having a plurality of openings therethrough, the openings in each transverse portion having Walls converging in the normal direction of gas flow.

11. A mufi'ler comprising a longitudinal casing, and a plurality of structurally independent batlle elements disposed in series Within said casing, each element having a longitudinally extending portion and oppositely directed transverse portions integral with the first said portion and extending from opposite ends thereof to the interior wall of the casing, each transverse portion and each 1011- gitudinally extending portion having a plurality of openings therethrough, the openings in each transverse portion having Walls converging in the normal direction of gas flow.

12. A mufiler comprising a longitudinal c: sing and a plurality of metal bafile elements disposed in said casing, each element having a portion extending longitudinally and transversely of the casing and a portion at each end of the first said portion extending at an angle thereto transversely of the casing, said lastmentioned portions extending in opposite directions, said elements being disposed in said casing With the first said portions in substantial alignment and abutting one another, alternate similarly extending second said port ons of a. group of said elements having apertures of one size there-- through, and intermediate similarly extending second said portions of said elements of the same group having apertures of a ditlerent size therethrough.

In Witness of the foregoing I ailix my sig= nature.

ALBERT F. DORMEYER. 

